package com.spzx.order.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.spzx.cart.api.RemoteCartService;
import com.spzx.cart.api.domain.CartInfo;
import com.spzx.common.core.constant.SecurityConstants;
import com.spzx.common.core.context.SecurityContextHolder;
import com.spzx.common.core.domain.R;
import com.spzx.common.core.exception.ServiceException;
import com.spzx.common.core.utils.StringUtils;
import com.spzx.common.rabbit.constant.MqConst;
import com.spzx.common.rabbit.service.RabbitService;
import com.spzx.order.api.domain.OrderInfo;
import com.spzx.order.api.domain.OrderItem;
import com.spzx.order.domain.OrderLog;
import com.spzx.order.form.OrderForm;
import com.spzx.order.mapper.OrderInfoMapper;
import com.spzx.order.mapper.OrderItemMapper;
import com.spzx.order.mapper.OrderLogMapper;
import com.spzx.order.service.IOrderInfoService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.spzx.order.vo.TradeVo;
import com.spzx.product.api.RemoteProductService;
import com.spzx.product.api.RemoteSkuStockService;
import com.spzx.product.api.domain.SkuLockVo;
import com.spzx.product.api.domain.SkuPriceVo;
import com.spzx.user.api.RemoteUserAddressService;
import com.spzx.user.api.domain.UserAddress;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.util.*;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * <p>
 * 订单 服务实现类
 * </p>
 *
 * @author atguigu
 * @since 2024-11-20
 */
@Service
public class OrderInfoServiceImpl extends ServiceImpl<OrderInfoMapper, OrderInfo> implements IOrderInfoService {

    @Autowired
    private RemoteCartService remoteCartService;

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private RemoteUserAddressService remoteUserAddressService;

    @Autowired
    private OrderItemMapper orderItemMapper;

    @Autowired
    private OrderLogMapper orderLogMapper;

    @Autowired
    private RemoteProductService remoteProductService;

    @Autowired
    private RemoteSkuStockService remoteSkuStockService;
    @Autowired
    private RabbitService rabbitService;
    @Override
    public TradeVo orderTradeData() {
        //获取购物车中选中的商品列表
        R<List<CartInfo>> cartInfoCheckedListResult = remoteCartService.getCartCheckedList(SecurityConstants.INNER);
        if (R.FAIL==cartInfoCheckedListResult.getCode()){
            throw new ServiceException(cartInfoCheckedListResult.getMsg());
        }
        //将购物车中的商品列表(List<CartInfo>)转换成订单中的商品列表（List<OrderItem>）
        List<CartInfo> cartInfoList = cartInfoCheckedListResult.getData();
        List<OrderItem> orderItemList=null;
        if (!CollectionUtils.isEmpty(cartInfoList)){
            orderItemList = cartInfoList.stream().map(cartInfo -> {
                OrderItem orderItem = new OrderItem();
                BeanUtils.copyProperties(cartInfo, orderItem);
                return orderItem;
            }).collect(Collectors.toList());
        }
        //计算总金额
        BigDecimal totalAmount = orderItemList.stream().map(orderItem -> orderItem.getSkuPrice()
                .multiply(new BigDecimal(orderItem.getSkuNum())))
                //reduce：统计，ADD：加法，BigDecimal.ZERO：从零开始加
                .reduce(BigDecimal.ZERO, BigDecimal::add);

        TradeVo tradeVo = new TradeVo();
        tradeVo.setTradeNo(generateTradeNo(SecurityContextHolder.getUserId()));
        tradeVo.setOrderItemList(orderItemList);
        tradeVo.setTotalAmount(totalAmount);
        return tradeVo;
    }

    @Transactional
    @Override
    public Long submitOrder(OrderForm orderForm) {

        Long userId = SecurityContextHolder.getUserId();
        /*if (!this.checkTradeNo(userId.toString(),orderForm.getTradeNo())){
            throw new ServiceException("请勿重复提交");
        //删除redis中的订单号
        this.deleteTradeNo(userId.toString());
        }*/
        //使用lua解决原子性的问题
        String userTradeKey = "user:tradeNo:" + userId;
        // 将键的值更为 processed  表示已处理  return 1 表示处理成功
        // return -1  键存在但值不匹配，表示重复提交
        // return 0   键不存在，订单过期
        String scriptText = """
        if redis.call('get', KEYS[1]) == ARGV[1] then
            redis.call('set', KEYS[1], 'processed')
            return 1
        else
           if redis.call('exists', KEYS[1]) == 1 then
              redis.call('del',KEYS[1])
              return -1
           else
              return 0
           end
       end
       """;
        DefaultRedisScript<Long> redisScript = new DefaultRedisScript<>();
        redisScript.setScriptText(scriptText);
        redisScript.setResultType(Long.class);
        Long flag = (Long)redisTemplate.execute(redisScript, Arrays.asList(userTradeKey), orderForm.getTradeNo());
        if (flag == 0) {
            throw new ServiceException("操作超时，请退回重试");
        }
        if(flag == -1){
            throw new ServiceException("请勿重复提交订单");
        }


        //批量获取商品skuId
        List<OrderItem> orderItemList = orderForm.getOrderItemList();
        List<Long> skuIdList = orderItemList.stream().map(orderItem -> orderItem.getSkuId()).collect(Collectors.toList());


        //批量获取商品实时价格
        R<List<SkuPriceVo>> skuPriceListResult = remoteProductService.getSkuPriceList(skuIdList, SecurityConstants.INNER);
        if (R.FAIL==skuPriceListResult.getCode()){
            throw new ServiceException(skuPriceListResult.getMsg());
        }
        //获取实时商品价格列表
        List<SkuPriceVo> skuPriceVoList = skuPriceListResult.getData();
        //将列表转换为map
        //key: skuId, value: salePrice
        Map<Long, BigDecimal> skuPriceMap = skuPriceVoList.stream().collect(Collectors.toMap(SkuPriceVo::getSkuId, SkuPriceVo::getSalePrice));
        String priceCheckResult="";
        for (OrderItem orderItem : orderItemList) {
            if (orderItem.getSkuPrice().compareTo(skuPriceMap.get(orderItem.getSkuId()))!=0){
                //价格发生了变化
                priceCheckResult+=orderItem.getSkuName()+"\n";
            }
        }
        //检查是否有商品价格发生了变化
        if(!StringUtils.isEmpty(priceCheckResult)){
            if (!orderForm.getIsBuy()){
                //更新购物车中的价格
                remoteCartService.updateCartPrice(SecurityConstants.INNER);
            }
            throw new ServiceException("价格发生变化，请重新下单：\n"+priceCheckResult);
        }

        //检查库存,如果有,则锁定库存
        String tradeNo = orderForm.getTradeNo();
        List<SkuLockVo> skuLockVoList= orderItemList.stream().map(orderItem -> {
            SkuLockVo skuLockVo = new SkuLockVo();
            skuLockVo.setSkuId(orderItem.getSkuId());
            skuLockVo.setSkuNum(orderItem.getSkuNum());
            skuLockVo.setSkuName(orderItem.getSkuName());
            return skuLockVo;
        }).collect(Collectors.toList());

        R<String> checkAndLockResult = remoteSkuStockService.checkAndLock(tradeNo, skuLockVoList, SecurityConstants.INNER);
        if (R.FAIL==checkAndLockResult.getCode()){
            throw new ServiceException(checkAndLockResult.getMsg());
        }
        String resultString = checkAndLockResult.getData();
        if (!"success".equals(resultString)){
            throw new ServiceException(resultString);
        }

        // 下单
        Long orderId = null;
        try {
            orderId = this.saveOrder(orderForm);
        } catch (Exception e) {
            e.printStackTrace();
            //下单失败，解锁库存
            rabbitService.sendMessage(MqConst.EXCHANGE_PRODUCT, MqConst.ROUTING_UNLOCK, orderForm.getTradeNo());
            //抛出异常
            throw new ServiceException("下单失败");
        }

        //删除购物车中的选中商品
        if (!orderForm.getIsBuy()){
            R<Boolean> deleteResult = remoteCartService.deleteCartCheckedList(SecurityConstants.INNER);
            if (R.FAIL==deleteResult.getCode()){
                log.error(deleteResult.getMsg());
            }

        }

        return orderId;
    }

    @Override
    public List<OrderInfo> selectUserOrderInfoList(Integer orderStatus) {
        // 获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();

        List<OrderInfo> orderInfoList = baseMapper.selectList(
                new LambdaQueryWrapper<OrderInfo>()
                        .eq(OrderInfo::getUserId, userId)
                        .eq(orderStatus != null, OrderInfo::getOrderStatus, orderStatus)
                        .orderByDesc(OrderInfo::getCreateTime)
        );
        if (!CollectionUtils.isEmpty(orderInfoList)){
            List<Long> orderIdList = orderInfoList.stream().map(OrderInfo::getId).collect(Collectors.toList());
            //查询orderItem
            List<OrderItem> orderItemList = orderItemMapper.selectList(
                    new LambdaQueryWrapper<OrderItem>().in(OrderItem::getOrderId, orderIdList)
            );
            Map<Long, List<OrderItem>> orderIdToOrderItemListMap = orderItemList.stream().collect(
                    Collectors.groupingBy(OrderItem::getOrderId)
            );
            //组装orderItemList
            orderInfoList.forEach(item -> {
                item.setOrderItemList(orderIdToOrderItemListMap.get(item.getId()));
            });
        }

        return orderInfoList;
    }

    @Override
    public OrderInfo selectOrderInfoById(Long orderId) {

        OrderInfo orderInfo = baseMapper.selectById(orderId);
        orderInfo.setOrderItemList(orderItemMapper.selectList(new LambdaQueryWrapper<OrderItem>().eq(OrderItem::getOrderId,orderId)));
        return orderInfo;
    }

    @Override
    public void cancelOrder(Long orderId) {
        OrderInfo orderInfo = baseMapper.selectById(orderId);
        if(orderInfo != null && orderInfo.getOrderStatus().intValue() == 0) {//待付款
            orderInfo.setOrderStatus(-1);//已取消
            orderInfo.setCancelTime(new Date());
            orderInfo.setCancelReason("用户取消订单");
            baseMapper.updateById(orderInfo);
            //记录日志
            OrderLog orderLog = new OrderLog();
            orderLog.setOrderId(orderInfo.getId());
            orderLog.setProcessStatus(-1);
            orderLog.setNote("用户取消订单");
            orderLogMapper.insert(orderLog);
            //发送MQ消息通知商品系统解锁库存：TODO
            rabbitService.sendMessage(MqConst.EXCHANGE_PRODUCT, MqConst.ROUTING_UNLOCK, orderInfo.getOrderNo());
        }
    }

    @Override
    public OrderInfo getByOrderNo(String orderNo) {
        //订单
        OrderInfo orderInfo = baseMapper.selectOne(
                new LambdaQueryWrapper<OrderInfo>().eq(OrderInfo::getOrderNo, orderNo)
        );
        //订单详情
        List<OrderItem> orderItemList = orderItemMapper.selectList(
                new LambdaQueryWrapper<OrderItem>().eq(OrderItem::getOrderId, orderInfo.getId())
        );
        orderInfo.setOrderItemList(orderItemList);
        return orderInfo;
    }

    private Long saveOrder(OrderForm orderForm) {
        Long userId = SecurityContextHolder.getUserId();
        String userName = SecurityContextHolder.getUserName();
        // 保存订单记录：order_info
        OrderInfo orderInfo = new OrderInfo();
        orderInfo.setUserId(userId);
        orderInfo.setOrderNo(orderForm.getTradeNo());//订单号
        orderInfo.setNickName(userName);
        orderInfo.setRemark(orderForm.getRemark());
        orderInfo.setFeightFee(orderForm.getFeightFee());

        //远程调用收货人地址信息
        R<UserAddress> userAddressResult = remoteUserAddressService.getUserAddress(orderForm.getUserAddressId(), SecurityConstants.INNER);
        if (R.FAIL==userAddressResult.getCode()){
            throw new ServiceException(userAddressResult.getMsg());
        }
        //获取用户地址信息
        UserAddress userAddress = userAddressResult.getData();
        //保存用户地址信息
        orderInfo.setReceiverName(userAddress.getName());
        orderInfo.setReceiverPhone(userAddress.getPhone());
        orderInfo.setReceiverTagName(userAddress.getTagName());
        orderInfo.setReceiverProvince(userAddress.getProvinceCode());
        orderInfo.setReceiverCity(userAddress.getCityCode());
        orderInfo.setReceiverDistrict(userAddress.getDistrictCode());
        orderInfo.setReceiverAddress(userAddress.getFullAddress());

        List<OrderItem> orderItemList=orderForm.getOrderItemList();
        //计算总金额
        BigDecimal totalAmount = orderItemList.stream().map(orderItem -> orderItem.getSkuPrice()
                        .multiply(new BigDecimal(orderItem.getSkuNum())))
                //reduce：统计，ADD：加法，BigDecimal.ZERO：从零开始加
                .reduce(BigDecimal.ZERO, BigDecimal::add);

        //设置商品总价格
        orderInfo.setTotalAmount(totalAmount);
        orderInfo.setCouponAmount(new BigDecimal(0));//优惠券价格
        orderInfo.setOriginalTotalAmount(totalAmount);//原价
        //订单状态
        orderInfo.setOrderStatus(0);//待付款

        orderInfo.setCreateBy(userName);
        orderInfo.setUpdateBy(userName);
        baseMapper.insert(orderInfo);

        // 保存订单项记录：order_item
        for (OrderItem orderItem : orderItemList) {
            orderItem.setOrderId(orderInfo.getId());
            orderItem.setCreateBy(userName);
            orderItem.setUpdateBy(userName);
            orderItemMapper.insert(orderItem);
        }

        // 保存订单日志记录：order_log
        OrderLog orderLog = new OrderLog();
        orderLog.setOrderId(orderInfo.getId());
        orderLog.setProcessStatus(0);
        orderLog.setOperateUser(userName);
        orderLog.setNote("提交订单");
        orderLog.setCreateBy(userName);
        orderLog.setUpdateBy(userName);
        orderLogMapper.insert(orderLog);

        return orderInfo.getId();
    }


    /**
     * 渲染订单确认页面-生成用户流水号
     *
     * @param userId
     * @return
     */
    private String generateTradeNo(Long userId) {
        //1.构建流水号Key
        String userTradeKey = "user:tradeNo:" + userId;
        //2.构建流水号value
        String tradeNo = UUID.randomUUID().toString().replaceAll("-", "");
        //3.将流水号存入Redis 暂存5分钟
        redisTemplate.opsForValue().set(userTradeKey, tradeNo, 5, TimeUnit.MINUTES);
        return tradeNo;
    }

    /**
     * 验证页面提交流水号是否有效
     *
     * @param userId
     * @param tradeNo
     * @return
     */
    private Boolean checkTradeNo(String userId, String tradeNo) {
        String userTradeKey = "user:tradeNo:" + userId;
        String redisTradeNo = (String) redisTemplate.opsForValue().get(userTradeKey);
        return tradeNo.equals(redisTradeNo);
    }


    /**
     * 删除流水号
     *
     * @param userId
     */
    private void deleteTradeNo(String userId) {
        String userTradeKey = "user:tradeNo:" + userId;
        redisTemplate.delete(userTradeKey);
    }
}

























